Circuit protection device

Abstract

The utility model discloses a circuit protection device, which comprises a shell consisting of a base and an upper cover, and further comprises a partition plate, a circuit board, an alternating current power supply channel, a synchronous conversion unit, a reset operation mechanism, a tripping operation mechanism, a ground fault detection driving unit and a test and reset switch, and the functions of grounding fault protection and synchronous connection of alternating current power supply channels are realized. The circuit protection device has a manual mechanical tripping function, and ensures that an alternating current power supply leading to a load line can be forcibly cut off manually when the circuit protection device has a circuit fault or the load line has a fault; the circuit protection device has the function of a synchronous conversion unit, realizes synchronous power supply of the load terminal and the socket terminal, improves the current bearing capacity and reliability of the circuit protection device, and ensures that power cannot be taken from the socket terminal in the installation process when an alternating current power supply is reversely connected to the load terminal so as to prompt that the circuit protection device is installed mistakenly.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit protection, and in particular, relates to a circuit protection device. Background Art

[0002] Residual current operated protection devices, or ground fault circuit protection devices, are used to detect ground fault currents occurring in electrical appliances, instruments, devices, equipment, electrical systems and other electrical appliances and power supply lines powered by the power grid. When the ground fault current exceeds the specified limit, the above protection device will automatically cut off the power supply, thereby achieving the purpose of protecting personal and property safety. In actual use, the ground fault detection circuit of the residual current operated protection device or the ground fault circuit protection device often fails partially or completely, resulting in failure of the protection function, and the user is unaware of this at this time, which poses a safety hazard. In actual use, for a circuit protection device that has both a load output terminal and a socket output terminal, when the AC power supply is mistakenly connected from the load terminal due to incorrect wiring, the socket terminal is directly connected to the load terminal and loses its protection function, and the user is unaware of this at this time, which poses a safety hazard.

[0003] In order to solve the above problems, some circuit protection devices are equipped with manual test buttons to electrically test whether the protection device can work properly. However, when the protection device fails and loses its protection ability, the user cannot manually trip the protection device in the faulty state, and cannot cut off the AC power to the load terminals and socket terminals in time, which poses a safety hazard.

[0004] In order to solve the above problems, some circuit protection devices are equipped with a circuit breaker device to connect the AC power supply to the load terminal and the socket terminal respectively, so that the load terminal and the socket terminal are separated from each other to prevent the AC power supply from being mistakenly connected from the load terminal due to incorrect wiring, resulting in the socket terminal being energized. However, the above design often causes unbalanced loads on multiple sets of contacts because multiple sets of contacts are set on the same action mechanism; in addition, in some laboratory occasions, multiple sets of instruments and equipment are connected to the load terminal and the socket terminal respectively. When the above multiple sets of contacts are used for power supply, when one or more of the contacts are in poor contact or disconnected, the synchronization of the power supply will be affected, and the user is not aware of this at this time, resulting in reduced performance of the power supply system. Summary of the invention

[0005] This application is an extension of CN 105609382 B patent, and the contents described in CN 105609382 B patent will be cited in this patent.

[0006] A technical problem to be solved by the present application is to provide a circuit protection device with manual mechanical tripping. When a circuit protection device fails, manual forced tripping is implemented mechanically to cut off the AC power to the load terminals and the socket terminals.

[0007] Another technical problem to be solved by the present application is to provide a mechanical synchronization mechanism for the circuit protection device, in which the load terminal and the socket terminal are connected to each other under the correct wiring condition. During the installation process, when the AC power supply is reversely connected from the load terminal, it is ensured that power cannot be taken from the socket terminal to indicate a wiring error.

[0008] In order to solve the above technical problems, the technical solution adopted in this application is:

[0009] A circuit protection device comprises an AC power supply channel, a ground fault circuit interruption unit and a synchronous conversion unit, wherein:

[0010] The AC power supply channel includes a power terminal, a load terminal, a socket terminal and a main power switch, wherein the power terminal is used to input AC power, the load terminal and the socket terminal are used to connect the load, and the main power switch is used to connect or disconnect the electrical channel from the power terminal to the load terminal and the socket terminal;

[0011] The ground fault circuit interruption unit includes a ground fault detection drive unit, a reset operating mechanism, a trip operating mechanism and a test and reset switch;

[0012] The reset operating mechanism includes a reset button, a reset spring, a reset rod, a lifter, a lock pin, a trip armature and a trip coil. By changing the relative positions between the lock pin, the reset rod and the lifter, the lifter is controlled to move up and down, and the main power switch, the test and reset switches are closed or disconnected;

[0013] The tripping operating mechanism includes a tripping button, a tripping spring and a tripping slider. The lower end of the tripping button includes a tripping push rod inclined surface, one side of the tripping slider includes a tripping slider inclined surface, and the other side of the tripping slider includes a tripping vertical surface. The tripping push rod inclined surface contacts the tripping slider inclined surface, and the tripping vertical surface contacts the end surface of the locking pin. When the tripping button is manually pressed, the tripping push rod inclined surface contacts the tripping slider inclined surface and slides relatively, and the tripping slider is moved, and the locking pin follows the tripping slider to move, thereby disconnecting the main power switch.

[0014] Furthermore, the synchronous conversion unit is used to disconnect the electrical connection between the load terminal and the socket terminal when the external plug is inserted into the socket terminal.

[0015] Furthermore, the circuit protection device further comprises a base and an upper cover, a grounding plate is provided between the upper cover and the base, and the synchronous conversion unit comprises a synchronous push plate, a synchronous spring, a first synchronous conductive sheet and a second synchronous conductive sheet, wherein:

[0016] One end of the synchronization spring is pressed on the synchronization push plate, and the other end of the synchronization spring is pressed on the ground plate, and the synchronization spring works in a compressed state;

[0017] One end of the first synchronous conductive sheet is fixedly connected to the socket terminal, and the other end of the first synchronous conductive sheet moves with the synchronous push plate;

[0018] One end of the second synchronous conductive sheet is fixedly connected to the socket terminal, and the other end of the second synchronous conductive sheet follows the movement of the synchronous push plate.

[0019] Furthermore, the synchronous push plate includes at least one inclined block, each of which is opposite to the socket terminal. When the external pin is inserted into the socket terminal, the end of the external grounding pin contacts and slides relatively with the inclined block of the synchronous push plate, pushing the synchronous push plate, thereby pushing the first synchronous conductive plate and the second synchronous conductive plate, thereby disconnecting the electrical connection between the socket terminal and the load terminal.

[0020] Furthermore, the ground fault detection drive unit is used to detect the ground fault current in the AC power supply channel and drive the trip coil to work, thereby changing the relative position between the lock pin and the reset rod and the lifter through the trip armature.

[0021] Furthermore, the test and reset switch is used to test the ground fault protection function of the circuit protection device. When the test and reset switch is closed, a ground fault current will be generated in the AC power supply channel and the ground fault detection drive circuit will be triggered to work.

[0022] A circuit protection device proposed in the present application implements artificial mechanical tripping of the circuit protection device, thereby realizing mechanical forced tripping of a circuit protection device that is not energized or even has a circuit fault; the synchronous conversion unit adopts a mechanical method with a simple structure to realize synchronous power supply of the load terminal and the socket terminal, thereby improving the current carrying capacity and reliability of the circuit protection device. At the same time, during the installation process, when the AC power supply is reversely connected to the load terminal, it is ensured that power cannot be taken from the socket terminal to indicate that the circuit protection device has been incorrectly installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The appearance diagram of the circuit protection device for this application;

[0024] Figure 2 A circuit schematic diagram of the circuit protection device for this application;

[0025] Figure 3 This is a schematic diagram of the internal structure of the circuit protection device of this application;

[0026] Figure 4 This is a diagram of components related to the reset and tripping process of an embodiment of the present application;

[0027] Figure 5 This is a schematic diagram of the reset state of an embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the tripping state of an embodiment of the present application;

[0029] Figure 7 This is a schematic diagram of a synchronous conversion unit according to an embodiment of the present application;

[0030] Figure 8 This is a schematic diagram of the synchronous closed state of an embodiment of the present application;

[0031] Fig. 9 This is a schematic diagram of the synchronous disconnection state of an embodiment of the present application.

[0032] The following are the descriptions of the reference numerals:

[0033] 1. Base; 2. Upper cover; 3. Partition; 4. AC power supply channel; 5. Ground fault circuit interruption unit; 6. Synchronous conversion unit; 8. Grounding pin; 16. Grounding plate; 16B. Grounding screw; 84. Circuit board; 42. Power terminal; 42A. First power pin; 42B. Second power pin; 48. Load terminal; 48A. First load pin; 48B. Second load pin; 49. Socket terminal; 49A. First socket pin; 49B. Second socket pin; 49C. Grounding pin; 44. Power main switch; 44A. First power moving contact piece (44-1 and 44-2); 44B. Second power moving contact piece (44-3 and 44-4); 51. Ground fault detection Test drive unit; 515, reset operating mechanism; 25, reset button; 28, reset spring; 26, reset rod; 68, lifter; 72, lock pin; 72A, lock pin left end face 72A; 78, trip armature; 80, lock pin spring; 76, trip coil; trip operating mechanism (516); 32, trip button; 33, trip spring; 34, trip slider; 32A, trip push rod inclined surface; 34A, trip slider inclined surface; 34B, trip vertical surface; 92, test and reset switch; 92A, moving contact piece; 92B, static contact piece; 601, synchronous push plate; 602, synchronous spring; 603A, first synchronous conductive piece; 603B, second synchronous conductive piece; 601A, synchronous inclined block. DETAILED DESCRIPTION

[0034] The technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments do not constitute a limitation to the present application.

[0035] An embodiment of the present application, such as Figure 1As shown, a circuit protection device is proposed, which has a housing, which is composed of a base 1 and an upper cover 2, a reset button 25 and a trip button 32 on the upper cover 2, and at least one set of socket terminals 49 (including three pins: a first socket pin 49A, a second socket pin 49B and a ground pin 49C) is arranged between the upper cover 2 and the base 1. A pair of power terminals 42 (including two pins: a first power pin 42A and a second power pin 42B) are installed on the left rear side and the left front side of the base 1, and a pair of load terminals 48 (including two pins: a first load pin 48A and a second load pin 48B) are installed on the right rear side and the right front side of the base 1. A grounding plate 16 is installed between the upper cover 2 and the base 1, and a grounding screw 16B is arranged on the grounding plate 16 for connecting the grounding protection wire. The grounding pin 49C is connected to the grounding plate 16. The power terminal 42 is used to connect the phase line and the neutral line of the AC power supply. The load terminal 48 and the socket terminal 49 are used to connect the phase line and the neutral line of the load.

[0036] Figure 2 The circuit principle of the circuit protection device of the present application is shown, and the control relationship of each functional unit of the circuit protection device is demonstrated. The circuit protection device of the present application comprises an AC power supply channel 4, a ground fault circuit interruption unit 5 and a synchronous conversion unit 6.

[0037] The AC power channel 4 includes a power terminal 42, a power main switch 44, a load terminal 48 and a socket terminal 49. The power terminal 42 is used to connect the AC power source, the load terminal 48 and the socket terminal 49 are used to connect the load, and the power main switch 44 is used to connect or disconnect the electrical channel from the power terminal 42 to the load terminal 48 and the socket terminal 49.

[0038] The ground fault circuit interruption unit 5 includes a ground fault detection drive unit 51 , a reset operating mechanism 515 , a trip operating mechanism 516 and a test and reset switch 92 .

[0039] The reset operating mechanism 515 includes a reset button 25, a reset spring 28, a reset rod 26, a lifter 68, a lock pin 72, a trip armature 78, a lock pin spring 80 and a trip coil 76. The lock pin 72, the reset rod 26 and the lifter 68 form an interlocking relationship. By changing the relative positions of the lock pin 72, the reset rod 26 and the lifter 68, the lifter 68 can be controlled to move up and down, and the main power switch 44 and the test and reset switch 92 can be closed or disconnected.

[0040] The ground fault detection drive unit 51 is used to detect the ground fault current in the AC power supply channel 4 and drive the trip coil 76 to work, push the trip armature 78 and the lock pin 72, and change the relative position between the lock pin 72 and the reset rod 26 and the lifter 68.

[0041] The test and reset switch 92 is used to test the ground fault protection function of the circuit protection device. When the test and reset switch 92 is closed, a ground fault current will be generated in the AC power supply channel 4 and the ground fault detection drive unit 51 will be triggered to work.

[0042] Manually pressing the reset button 25 moves the reset rod 26 downward, which can change the relative positions of the lock pin 72, the reset rod 26 and the lifter 68, so that the main power switch 44 is closed. Manually pressing the reset button 25 pushes the reset rod 26 downward, which will cause the lock pin 72 and the lifter 68 to move downward with the reset rod 26 until the lifter 68 reaches the test position, and the test and reset switch 92 is turned on, thereby testing the ground fault function. When the test passes, the reset is completed (the main power switch 44 is turned on).

[0043] It should be noted that the working principle of the ground fault circuit interruption unit 5 has been described in detail in an authorized invention patent (publication number CN105609382A) of the applicant, and will not be repeated here. The difference is that the present application improves the structure of the tripping operating mechanism 516.

[0044] The tripping operating mechanism 516 includes a tripping button 32, a tripping spring 33 and a tripping slider 34, and is used to change the relative positions between the lock pin 72, the reset rod 26 and the lifter 68, so that the lifter 68 moves downward and the main power switch 44 is disconnected. The tripping operating mechanism is used to change the position of the lock pin, thereby changing the relative positions between the lock pin, the reset rod and the lifter, controlling the lifter to move, and disconnecting the main power switch.

[0045] The synchronous conversion unit 6 is used to connect the load terminal 48 and the socket terminal 49. When the external plug is inserted into the socket terminal 49, the electrical connection between the load terminal 48 and the socket terminal 49 is disconnected to prevent the power supply from being wrongly connected to the load terminal and damaging the electrical appliance plugged into the socket segment.

[0046] Figure 3 The internal structure of the circuit protection device of the present application is shown, wherein the partition 3 is placed between the base 1 and the upper cover 2, the grounding plate 16 is placed on the partition 3, and the circuit board 84 is placed on the base 1. The stationary contact piece 92B of the test and reset switch 92 is fixed on the circuit board 84, and the moving contact piece 92A of the test and reset switch 92 is fixed to the bottom of the lifter 68.

[0047] It should be noted that the circuit protection device of the present application further includes a circuit board 84 , on which the ground fault detection drive unit 51 and the test and reset switch 92 are arranged, which will not be described in detail below.

[0048] Figure 4-6The tripping action process of the embodiment of the present application is shown, showing the position relationship of the components in the mechanical tripping process of the circuit protection device. Among them:

[0049] Figure 4 The figure shows the components related to the reset and tripping process. The right side of the lower end of the trip button 32 includes a trip push rod inclined surface 32A, the left side of the trip slider 34 includes a trip slider inclined surface 34A, and the right side of the trip slider 34 includes a trip vertical surface 34B. The trip push rod inclined surface 32A contacts the trip slider inclined surface 34A, and the trip vertical surface 34B contacts the left end surface of the lock pin 72.

[0050] Figure 5 and Figure 6 Figure 2 is a diagram of the reset state and tripping state of the circuit protection device. Figure 5 As shown in FIG. 1 , after the circuit protection device is reset, the lifter 68 is in the reset position, the lock pin 72 and the reset rod 26 are in the locked state, the main power switch 44 is closed, and the left end of the lock pin 72 contacts the trip vertical surface 34B of the trip slider 34. In the reset state, the trip button 32 is manually pressed downward, and the trip push rod inclined surface 32A moves downward, so that the trip push rod inclined surface 32A and the trip slider inclined surface 34A contact and slide relative to each other, so that the trip slider 34 moves to the right, and the lock pin 72 moves to the right with the trip slider 34 until the unlocked state is reached, so that the lifter is separated from the reset rod, and the lifter returns to the trip position, as shown in FIG. Figure 6 As shown, the main power switch 44 is disconnected to achieve mechanical tripping.

[0051] It should be noted that in the improved trip operating mechanism 516 of the present application, the trip button 32 is a simple columnar member, and the trip slider 34 is located in the partition. Such an arrangement makes the structure and process of the entire device simpler.

[0052] When the trip button is pressed manually, the inclined surface of the trip push rod contacts and slides relatively with the inclined surface of the trip slider, the trip slider is moved, and the lock pin moves with the trip slider, thereby changing the relative position relationship between the lock pin, the lifter and the reset rod, causing the lifter to move, disconnecting the main power switch, and realizing mechanical tripping. The process is as follows: when the circuit protection device is in the reset position, the lifter is in the reset position, the lock pin and the reset rod are in a locked state, the main power switch is closed, and the end of the lock pin contacts the trip vertical surface of the trip slider. At this time, the trip button is pressed manually, so that the inclined surface of the trip push rod contacts and slides relatively with the inclined surface of the trip slider, and the trip slider moves in a direction perpendicular to the movement direction of the trip button. The lock pin follows the trip slider to move until the unlocking position, so that the lifter is separated from the reset rod, and the lifter returns to the trip position, thereby disconnecting the main power switch, and realizing mechanical tripping. The above process is a simple mechanical process. When the circuit protection device is not powered on or even a circuit fault occurs, the circuit protection device can still be forced to trip.

[0053] Another embodiment of the present application provides a synchronous conversion unit 6 that is different from the prior art, including a synchronous push plate 601, a synchronous spring 602, and a first synchronous conductive sheet 603A and a second synchronous conductive sheet 603B. The synchronous conversion unit 6 is used to connect the load terminal 48 and the socket terminal 49. The synchronous spring pushes the synchronous push plate, so that the socket terminal and the load terminal become a pair of conductors, and the power terminal is another pair of conductors; at the same time, in the reset state, the purpose of synchronously connecting the socket terminal and the load terminal to the AC power supply can be achieved. When the external plug is inserted into the socket terminal 49, the electrical connection between the load terminal 48 and the socket terminal 49 is disconnected.

[0054] Figure 7-9 It is a schematic diagram of synchronous conversion of this embodiment, showing the positions of components in the synchronous conversion process.

[0055] like Figure 7 As shown, the synchronous conversion unit 6 includes a synchronous push plate 601, a synchronous spring 602, a first synchronous conductive sheet 603A and a second synchronous conductive sheet 603B. The synchronous push plate 601 is placed on the grounding plate 16, one end of the synchronous spring 602 is pressed on the synchronous push plate 601, and the other end of the synchronous spring 602 is pressed on the grounding plate 16, and the synchronous spring 602 works in a compressed state.

[0056] It should be noted that the grounding plate 16 is provided with a groove for accommodating the synchronization spring 602, and the synchronization push plate 601 is provided with a recessed portion recessed into the groove, so that one end of the synchronization spring 602 abuts against the recessed portion of the synchronization push plate 601, and the other end abuts against the side wall of the groove of the grounding plate 16.

[0057] One end of the first synchronous conductive sheet 603A is fixedly connected to the first socket pin 49A, and the other end of the first synchronous conductive sheet 603A moves with the synchronous push plate 601; one end of the second synchronous conductive sheet 603B is fixedly connected to the second socket pin 49B, and the other end of the second synchronous conductive sheet 603B moves with the synchronous push plate 601; the synchronous push plate 601 includes at least one synchronous bevel block 601A, and each synchronous bevel block 601A is directly opposite to the socket of the ground pin 49C.

[0058] It should be noted that the synchronous conductive sheet follows the synchronous push plate 601 by providing a stopper on the synchronous push plate 601 to contact the synchronous conductive sheet, which will not be described in detail here.

[0059] Figure 8Schematic diagram of synchronous closed state. The synchronous spring 602 pushes the synchronous push plate 601, so that the first synchronous conductive sheet 603A and the second synchronous conductive sheet 603B contact the first load pin 48A and the second load pin 48B respectively, that is, the first socket pin 49A is connected to the first load pin 48A via the first synchronous conductive sheet 603A, and the second socket pin 49B is connected to the second load pin 48B via the second synchronous conductive sheet 603B, so as to realize the electrical connection between the socket terminal 49 and the load terminal 48, so that the socket terminal (49A, 49B) and the load terminal (48A, 48B) become a pair of conductors, and the power supply terminal (42A, 42B) is another pair of conductors; at the same time, when resetting, the socket terminal (49A, 49B) and the load terminal (48A, 48B) can be synchronously connected to the AC power supply.

[0060] Fig. 9 Schematic diagram of synchronous disconnection state. When the grounding pin 8 of the external power plug is inserted downward (in the direction F shown in the figure) into the jack of the grounding pin 49C, the end of the grounding pin 8 contacts and slides relatively with the synchronous bevel 601A of the synchronous push plate 601, so that the synchronous push plate 601 moves rightward (in the direction E shown in the figure), and the synchronous push plate 601 pushes the first synchronous conductive sheet 603A connected to the first load pin 48A to the right, and at the same time, the synchronous push plate 601 pushes the second synchronous conductive sheet 603B connected to the second load pin 48B to the right, thereby disconnecting the electrical connection between the socket terminal 49 and the load terminal 48.

[0061] Therefore, during the installation of the circuit protection device, the accuracy of the wiring can be checked using the power plug: when reverse wiring occurs, that is, when the AC power is connected from the load terminal, power cannot be drawn from the socket terminal.

[0062] As known to those skilled in the art, the drawings and embodiments of this application are only for illustrating the functions, structures and principles of this application, and should not be construed as limiting the understanding of this application; at the same time, the purposes of this application have been achieved. The above embodiments may be modified without departing from the principles of this application, therefore, the protection of this application shall be subject to the scope described in the claims.

Claims

1. A circuit protection device, characterized in that: The circuit protection device comprises an AC power supply channel (4), a ground fault circuit interruption unit (5) and a synchronous conversion unit (6), wherein: The AC power channel (4) comprises a power terminal (42), a load terminal (48), a socket terminal (49) and a main power switch (44), wherein the power terminal (42) is used to input an AC power source, the load terminal (48) and the socket terminal (49) are used to connect a load, and the main power switch (44) is used to connect or disconnect an electrical channel from the power terminal (42) to the load terminal (48) and the socket terminal (49); The ground fault circuit interruption unit (5) comprises a ground fault detection drive unit (51), a reset operating mechanism (515), a trip operating mechanism (516) and a test and reset switch (92); The reset operating mechanism (515) comprises a reset button (25), a reset spring (28), a reset rod (26), a lifter (68), a lock pin (72), a trip armature (78) and a trip coil (76), and controls the lifter (68) to move up and down by changing the relative positions among the lock pin (72), the reset rod (26) and the lifter (68), and closes or disconnects the main power switch (44) and the test and reset switch (92); The tripping operating mechanism (516) comprises a tripping button (32), a tripping spring (33) and a tripping slider (34); the lower end of the tripping button (32) comprises a tripping push rod inclined surface (32A); one side of the tripping slider (34) comprises a tripping slider inclined surface (34A); the other side of the tripping slider (34) comprises a tripping vertical surface (34B); the tripping push rod inclined surface (32A) contacts the tripping slider inclined surface (34A); the tripping vertical surface (34B) contacts the end surface of the locking pin (72); when the tripping button (32) is manually pressed, the tripping push rod inclined surface (32A) contacts the tripping slider inclined surface (34A) and slides relative to each other; the tripping slider (34) is moved; the locking pin (72) moves along with the tripping slider (34) and the main power switch (44) is disconnected.

2. The circuit protection device according to claim 1, characterized in that: The circuit protection device further comprises a base (1) and an upper cover (2), a grounding plate (16) being arranged between the upper cover (2) and the base (1), and the synchronous conversion unit (6) comprising a synchronous push plate (601), a synchronous spring (602), a first synchronous conductive sheet (603A) and a second synchronous conductive sheet (603B), wherein: One end of the synchronization spring (602) is pressed on the synchronization push plate (601), and the other end of the synchronization spring (602) is pressed on the grounding plate (16), and the synchronization spring (602) works in a compressed state; One end of the first synchronous conductive sheet (603A) is fixedly connected to the socket terminal (49), and the other end of the first synchronous conductive sheet (603A) moves following the synchronous push plate (601); One end of the second synchronous conductive sheet (603B) is fixedly connected to the socket terminal (49), and the other end of the second synchronous conductive sheet (603B) follows the movement of the synchronous push plate (601).

3. The circuit protection device according to claim 2, characterized in that: The synchronous push plate (601) comprises at least one inclined block, each inclined block facing the socket terminal (49), and when the external plug is inserted into the socket terminal (49), the end of the external plug contacts and slides relatively with the inclined block of the synchronous push plate (601), thereby pushing the synchronous push plate (601), thereby pushing the first synchronous conductive sheet (603A) and the second synchronous conductive sheet (603B), and disconnecting the electrical connection between the socket terminal (49) and the load terminal (48).

4. The circuit protection device according to claim 1, wherein: The ground fault detection drive unit (51) is used to detect the ground fault current in the AC power supply channel (4) and drive the trip coil (76) to work, thereby changing the relative position between the lock pin (72) and the reset rod (26) and the lifter (68) through the trip armature (78).

Images